Add the required request argument to authenticate method
Add the required request argument to authenticate method

Ref: https://docs.djangoproject.com/en/2.2/topics/auth/customizing/#writing-an-authentication-backend

> An authentication backend is a class that implements two required
> methods: get_user(user_id) and authenticate(request, **credentials),
> as well as a set of optional permission related authorization methods.

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